Sadly, I don't think that I'll have my car back in time for this event.
I drove it down to the Light Car Co. this last Monday to be worked on. It was backfiring and popping, carbs were spitting, the idle was all over the place and it was generally not running very well. I suspect an air leak in the carbs as the shafts had some play - but we'll see. It did seem to be quite a fast change in behaviour, which I wouldn't expect from a slowly degrading seal. It may be something quick to fix, but realistically, I think the carbs will be off for a rebuild.
I'm hoping to have it back by mid-July for Classic Nostalgia at Shelsley, and the LMC national rally.